Part II: Writing Your Own Java Programs - Get a Free Blog

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30 Part I: Revving Up Figure 2-3: Confirming the location of your JavaDoc directory. If the wrong directory name appears in the text field, just click the Browse button and navigate to your computer’s Java home directory. For information on your computer’s Java home directory, see Step 6 of this chapter’s “Downloading and installing a Java compiler” section. 4. When you’re happy with the name in the home directory text field, click Next. The wizard’s last page (the JDK JavaDoc Directory page) appears. 5. Look at the text field on the JDK JavaDoc Directory page. Make sure that this field displays the name of your JavaDoc directory. (See Figure 2-3.) Normally, your JavaDoc directory’s name is the name of your Java home directory, followed by \docs. For information on your computer’s JavaDoc directory, see Step 4 of this chapter’s “Downloading and installing the Java API documentation” section. If the wrong directory name appears in the text field, just click the Browse button and navigate to your computer’s JavaDoc directory. If you do anything wrong in Steps 2 through 5, don’t fret. You can correct your mistake later. See this book’s Web site for details. 6. Click Finish. More free books @ www.BingEbook.com At this point, the JCreator work area opens. (See Figure 2-4.)
Figure 2-4: JCreator’s work area. More free books @ www.BingEbook.com In JCreator’s help files, the stuff in Figure 2-4 is called the workspace, not the work area. But elsewhere in these help files, JCreator reuses the word workspace to mean something entirely different. To avoid any confusion, I use two different terms. I use work area for the stuff in Figure 2-4, and I use workspace for that other, entirely different thing. (I explain that entirely different thing in Chapter 3.) Is That All There Is to It? Chapter 2: Setting Up Your Computer If you’re reading this paragraph, you’ve probably followed some of the instructions in this chapter — instructions for installing a Java compiler, the Java API documentation, and the JCreator IDE on your computer. So the burning question is, have you done the installation correctly? The answer to that question lies in Chapter 3, because in that chapter, you use these tools to run a brand new computer program. 31
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Page 5 and 6: About the Author More free books @
Page 7 and 8: Dedication More free books @ www.Bi
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Avoid the knee-jerk response. Some
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Chapter 5: Composing a Program One
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Figure 5-13: Whadaya mean “NoSuch
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Spaces and indentation Java isn’t
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Chapter 6 Using the Building Blocks
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Figure 6-2: A variable (before and
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Figure 6-4: Reading an assignment s
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Figure 6-6: An extreme close-up of
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Figure 6-7: Getting the value of a
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Methods and assignments Note how I
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You can’t drag statements outside
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In This Chapter Processing whole n
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eflected nicely in Java. In Listing
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Figure 7-4: How to make six kids ve
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Figure 7-5: Hey, bud! Got change fo
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Figure 7-7: Using preincrement. Mor
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To cram a double value into an int
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Look at the bold line of code in Fi
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Are you trying to decide between us
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Figure 7-13: Storing the digits 422
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Chapter 8 Numbers? Who Needs Number
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Figure 8-2: The action in Listing 8
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More free books @ www.BingEbook.com
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Figure 8-5: Stop those pots! The co
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I wish I could give you twelve simp
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To represent a lone character in th
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Figure 8-11: The Fahrenheit tempera
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Figure 8-13: The Fahrenheit variabl
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In This Chapter Chapter 9 Forks in
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Figure 9-3: An if statement and its
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Figure 9-4: The allknowing Java pro
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Randomness makes me dizzy When you
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Anyway, whether you’re skinning c
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Anyway, notice that the value of ra
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An elegant way to think about if st
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In This Chapter Chapter 10 Which Wa
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Figure 10-2: Admission prices for B
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Figure 10-4: The choices in Listing
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Figure 10-6: Running the code in Li
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Figure 10-8: A capital offense. Fig
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} } More free books @ www.BingEbook
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Listing 10-8: Proud Winners and Sor
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Chapter 11 How to Flick a Virtual S
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Figure 11-2: A fork with eleven pro
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Figure 11-4: How many days until th
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Figure 11-6: From your mind to the
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In This Chapter Chapter 12 Around a
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Figure 12-1: Momma needs a new pair
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Figure 12-4: Look! I rolled a seven
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Figure 12-5: You win sum; you lose
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Figure 12-8: An incorrect run. You
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If you’ve read this whole section
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Figure 12-11: Jumping into a loop.
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Figure 12-13: The strategy in Listi
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In This Chapter Chapter 13 Piles of
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218 Part III: Controlling the Flow
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Figure 15-5: A readable display of
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Figure 15-6: No! Don’t do it! Mor
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Figure 15-7: Here we go loop, do lo
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That’s why my writing a Java prog
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In general, a someEnumTypeName.valu
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Figure 15-10: Entering loops for th
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Figure 15-14: Traveling a second ti
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In This Chapter Using for loops to
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Listing 16-1 uses a for loop — a
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Figure 16-3: A few one-room reports
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Listing 16-3 has a big fat conditio
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guestsIn[6] = 0; On one weekday, bu
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In This Chapter Creating classes C
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Figure 17-2: The code in Listing 17
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The two programs (in Listings 17-1
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Listing 17-4: What It Means to Be a
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Figure 17-6: From one class come th
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Figure 17-7: A table of purchases.
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Chapter 18 Using Methods and Variab
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Putting String variables to good us
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To display a String value, you can
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Figure 18-4: This looks even worse.
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Figure 18-6: Viewing the String cla
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Combining and using data At this po
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Turning strings into numbers The co
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Figure 18-9: Do you have change for
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Packages and import declarations In
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That’s very nice! How about the S
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class Check { int number; double am
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Chapter 19 Creating New Java Method
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The last names in Figure 19-1 may s
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Figure 19-2: Two objects, each with
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Chapter 19: Creating New Java Metho
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} void fillWithData() { Random myRa
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} void display() { NumberFormat cur
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Figure 19-6: Passing a value to a m
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Figure 19-7: Cbj’s account and Br
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In This Chapter Swinging into acti
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Figure 20-1: What a nice window! Mo
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Figure 20-4: The frame in Listing 2
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Taking Action The previous section
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Figure 20-6: A brandnew frame. Figu
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In This Chapter Chapter 21 Ten Sets
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Chapter 22 Ten Useful Classes in th
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Math Do you have any numbers to cru
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• Symbols • && (and operator),
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• C • Calling addInterest Metho
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File➪Open Workspace (JCreator), 3
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errors, diagnosing errors. See also
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input file creating, 222-223 naming
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enum type, 176 Faulty Password Chec
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pack, 352 parentheses and, 328 pars
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method and, 328 parameters and, 336
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testing code, 222-224 troubleshooti
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static, 320-323 String class, 305-3
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